Method, user equipment and base station for transmitting uplink signals

1. A method for transmitting an uplink signal, the method comprising:

receiving, from a base station, uplink synchronization command information including resource allocation information on uplink signals of an uplink carrier or resource allocation information on uplink signals of a group of uplink carriers associated with a timing advance group (TAG);

identifying a first idle uplink signal resource in unlicensed frequency bands based on the resource allocation information included in the received uplink synchronization command information; and

transmitting, to the base station, the uplink signal using the first idle uplink signal resource,

wherein the first idle uplink signal resource is identified within an uplink signal transmission window of the uplink carrier in a time domain, or within the group of the uplink carriers associated with the TAG in a frequency domain.

2. The method of claim 1 , further comprising

determining whether an uplink signal resource subframe is idle based on a clear channel assessment (CCA) detection to the uplink signal resource subframe.

3. The method of claim 1 , wherein:

a starting point of the uplink signal transmission window is a subframe where the uplink synchronization command information is received, or a first uplink signal resource subframe after subframe (n+k), the uplink synchronization command information being received in subframe n and k being greater than or equal to a set constant;

length of the uplink signal transmission window is configured by a base station or is predefined; and

when the length of the uplink signal transmission window is configured by the base station, the length of the uplink signal transmission window is semi-statically configured by high-layer signaling or configured in the uplink synchronization command information.

4. The method of claim 3 , further comprising:

when second uplink synchronization command information is received in subframe j, and subframe j is in a first uplink signal transmission window, not transmitting the uplink signal within the first uplink signal transmission window:

for subframes before subframe (j+k) within the first uplink signal transmission window, performing a CCA detection to a corresponding uplink signal resource subframe based on indications of the uplink synchronization command information;

transmitting the uplink signal when there is an idle uplink signal resource subframe;

with starting from the first uplink signal resource subframe after subframe (j+k), performing the CCA detection to a corresponding uplink signal resource subframe based on indications of the second uplink synchronization command information; and

transmitting the uplink signal when there is an idle uplink signal resource subframe; or,

stopping the CCA detection within the first uplink signal transmission window, with starting from the first uplink signal resource subframe after subframe (j+k), performing the CCA detection to a corresponding uplink signal resource subframe, based on the second uplink synchronization command information, and transmitting the uplink signal when there is an idle uplink signal resource subframe.

5. A user equipment (UE), comprising:

a transceiver configured to communicate with a base station; and

a controller configured to:

receive, via the transceiver from the base station, uplink synchronization command information including resource allocation information on uplink signals of an uplink carrier or resource allocation information on uplink signals of a group of uplink carriers associated with a timing advance group (TAG),

identify a first idle uplink signal resource in unlicensed frequency bands based on the resource allocation information included in the received uplink synchronization command information, and

transmit, via the transceiver to the base station, an uplink signal using the first idle uplink signal resource,

wherein the first idle uplink signal resource is identified within an uplink signal transmission window of the uplink carrier in a time domain, or within the group of the uplink carriers associated with the TAG in a frequency domain.

6. A base station, comprising:

a transceiver configured to communicate with a terminal; and

a controller configured to:

transmit, via the transceiver to the terminal, uplink synchronization command information including resource allocation information on uplink signals of an uplink carrier or resource allocation information on uplink signals of a group of uplink carriers associated with a timing advance group (TAG), and

receive, via the transceiver from the terminal, an uplink signal through an uplink signal resource in unlicensed frequency bands, which is within an uplink signal transmission window of the uplink carrier in a time domain, or within the group of the uplink carriers associated with the TAG in a frequency domain, and stopping continuously receiving the uplink signal from the uplink signal transmission window after correctly receiving the uplink signal.

7. A method for transmitting an uplink signal, the method comprising:

receiving, from a base station, uplink synchronization command information including resource allocation information on uplink signals of one or more uplink carriers associated with a timing advance group (TAG);

selecting one or more uplink carriers from the TAG based on the resource allocation information; and

transmitting, to the base station, the uplink signal using a first idle uplink signal resource,

wherein the first idle uplink signal resource is within an uplink signal transmission window of the one or more uplink carriers.

8. A user equipment (UE), comprising:

a transceiver configured to communicate with a base station; and

a controller configured to:

receive, via the transceiver from a base station, uplink synchronization command information including resource allocation information on uplink signals of one or more uplink carriers associated with a timing advance group (TAG),

select one or more uplink carriers from the TAG based on the resource allocation information, and

transmit, via the transceiver to the base station, an uplink signal using a first idle uplink signal resource,

wherein the first idle uplink signal resource is within an uplink signal transmission window of the one or more uplink carriers.

9. A base station, comprising:

a transceiver configured to communicate with a terminal; and

a controller configured to:

transmit, via the transceiver to the terminal, uplink synchronization command information including resource allocation information on uplink signals of one or more uplink carriers associated with a timing advance group (TAG),

receive, via the transceiver from the terminal, an uplink signal of a corresponding uplink carrier through an uplink signal resource, which is within a respective uplink signal transmission window of all the uplink carriers, or configured uplink carriers of the TAG;

when allowing a user equipment (UE) to transmit an uplink signal on one uplink carrier, after correctly receiving an uplink signal of one uplink carrier, stop receiving the uplink signal of other uplink carriers; and

when allowing the UE to transmit the uplink signal on at least two uplink carriers, after correctly receiving the uplink signal of one uplink carrier, stop receiving the uplink signal on the other uplink carriers, or continuously receiving the uplink signal on the other uplink carriers.

10. The UE of claim 5 , wherein

the controller is further configured to determine whether an uplink signal resource subframe is idle by performing a clear channel assessment (CCA) detection to the uplink signal resource subframe.

11. The UE of claim 5 , wherein:

a starting point of the uplink signal transmission window is a subframe where the uplink synchronization command information is received, or a first uplink signal resource subframe after subframe (n+k), the uplink synchronization command information being received in subframe n and k is greater than or equal to a set constant; and

length of the uplink signal transmission window is configured by a base station or is predefined,

when the length of the uplink signal transmission window is configured by the base station, the length of the uplink signal transmission window is semi-statically configured by high-layer signaling or is configured in the uplink synchronization command information.

12. The UE of claim 11 , wherein

the controller is further configured to:

when second uplink synchronization command information is received in subframe j, and subframe j is in a first uplink signal transmission window, not transmit the uplink signal within the first uplink signal transmission window:

for subframes before subframe (j+k) within the first uplink signal transmission window, perform a CCA detection to a corresponding uplink signal resource subframe, based on indications of the uplink synchronization command information, and control the transceiver to transmit the uplink signal when there is an idle uplink signal resource subframe;

with starting from the first uplink signal resource subframe after subframe (j+k), perform the CCA detection to a corresponding uplink signal resource subframe based on indications of the second uplink synchronization command information, and control the transceiver to transmit the uplink signal when there is an idle uplink signal resource subframe; or

stop the CCA detection within the first uplink signal transmission window, with starting from the first uplink signal resource subframe after subframe (j+k), perform the CCA detection to a corresponding uplink signal resource subframe, based on the second uplink synchronization command information, and control the transceiver to transmit the uplink signal when there is an idle uplink signal resource subframe.

13. The UE of claim 8 , wherein indication mode of the resource allocation information comprises:

when there is a group of uplink signal resource indication bits in the uplink synchronization command information, indicating, by the group of uplink signal resource indication bits, uplink signal resource allocation of the N uplink carriers based on a predefined mode; and

when there are N groups of uplink signal resource indication bits in the uplink synchronization command information, respectively indicating, by the N groups of uplink signal resource indication bits, the uplink signal resource allocation of the N uplink carriers.

14. The UE of claim 13 , wherein indicating the uplink signal resource allocation of the N uplink carriers comprises:

determining uplink signal resources of an uplink carrier scheduled by the uplink synchronization command information based on a resource index indicated by the uplink signal resource indication bits; and

deriving the uplink signal resources of other uplink carriers from the resource index of the uplink carrier based on a signaling-configured or predefined mapping rule; and

wherein the uplink signal resources indicated by the uplink signal resource indication bits belong to an uplink carrier that possesses a smallest cell index of the TAG, the uplink signal resources of the other uplink carriers are derived from the resource index of the uplink carrier, based on the signaling-configured or predefined mapping rule.

15. The UE of claim 8 , wherein

the controller is further configured to determine whether an uplink signal resource subframe is idle by performing a CCA detection to the uplink signal resource subframe.

16. The UE of claim 15 , wherein a starting point of the uplink signal transmission window is a subframe where the uplink synchronization command information is received, or a first uplink signal resource subframe after subframe (n+k), wherein the uplink synchronization command information is received in subframe n, and k is greater than or equal to a set constant; and

wherein length of the uplink signal transmission window is configured by a base station or is predefined, when being configured by the base station, the length of the uplink signal transmission window is semi-statically configured by high-layer signaling or by the uplink synchronization command information.

17. The UE of claim 16 , wherein the uplink signal transmission window of each uplink carrier is configured independently or configured as a same.

18. The UE of claim 16 , wherein when selecting to transmit the uplink signal on one uplink carrier, transmitting the uplink signal using the first idle uplink signal resource within the uplink signal transmission window of the one or more uplink carriers comprises:

when all the uplink carriers of the TAG belong to unlicensed frequency bands, respectively, performing a CCA detection to a corresponding uplink signal transmission window of each uplink carrier of the TAG;

when an uplink signal resource subframe set of an uplink carrier, to which the CCA detection is performed, is a same, selecting an uplink carrier from uplink carriers with a same idle uplink signal resource subframe, to transmit the uplink signal;

when the uplink signal resource subframe set of each uplink carrier, to which the CCA detection is performed, is different, selecting, from first idle uplink signal resource subframes of all the uplink carriers, an uplink signal resource subframe that possesses an earliest transmission time to transmit the uplink signal; or

when all the uplink carriers of the TAG belong to the unlicensed frequency bands, respectively, performing the CCA detection to all the uplink carriers of the TAG within a corresponding uplink signal transmission window, and selecting an idle uplink carrier to transmit the uplink signal based on a predetermined priority.

19. The UE of claim 16 , wherein when selecting to transmit the uplink signal on at least two uplink carriers, transmitting the uplink signal using the first idle uplink signal resource within the uplink signal transmission window of the one or more uplink carriers comprises:

when all the uplink carriers of the TAG belong to unlicensed frequency bands, respectively, performing a CCA detection to all the uplink carriers of the TAG within a corresponding uplink signal transmission window, and respectively transmitting the uplink signal on each idle uplink carrier; or

when all the uplink carriers of the TAG belong to the unlicensed frequency bands, respectively, performing the CCA detection to each configured uplink carrier of the TAG within a corresponding uplink signal transmission window, and transmitting the uplink signal on an idle uplink carrier based on configuration information.

20. The UE of claim 8 , wherein further comprising:

the controller is further configured to:

when second uplink synchronization command information is received in subframe j, before transmitting the uplink signal, and the first uplink signal resource subframe after subframe (n+k) of at least one uplink carrier is located after subframe j:

for subframes located before subframe (j+k) within a first uplink signal transmission window, perform a CCA detection to a corresponding uplink signal resource subframe based on indications of the uplink synchronization command information, and transmit the uplink signal when there is an idle uplink signal resource subframe;

with starting from the first uplink signal resource subframe after subframe (j+k), perform the CCA detection to a corresponding uplink signal resource subframe based on indications of the second uplink synchronization command information, and transmit the uplink signal when there is an idle uplink signal resource subframe; or,

stop the CCA detection performed within the first uplink signal transmission window, with starting from the first uplink signal resource subframe after subframe (j+k), perform the CCA detection to a corresponding uplink signal resource subframe based on the second uplink synchronization command information, and transmit the uplink signal when there is an idle uplink signal resource subframe.